问题

Microblog is a platform ________ people canexpress their thoughts and communicate with each other by sending posts.

A:which
B:where
C:what
D:when

正确答案是：

同类题型

Two years later,her father disappeared,never________again. [ ]

He his homework Sunday evening.

It was five hours _____ the French climber reached thetop of the world’s tallest building.

looks very happy

large amount of work _________,thechief couldn’t spare time for a holiday